122664345721987 has 2 divisors, whose sum is σ = 122664345721988. Its totient is φ = 122664345721986.

The previous prime is 122664345721787. The next prime is 122664345722059. The reversal of 122664345721987 is 789127543466221.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122664345721987 is a prime.

It is a super-2 number, since 2×122664345721987² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (122664345721787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61332172860993 + 61332172860994.

It is an arithmetic number, because the mean of its divisors is an integer number (61332172860994).

Almost surely, 2^{122664345721987} is an apocalyptic number.

122664345721987 is a deficient number, since it is larger than the sum of its proper divisors (1).

122664345721987 is an equidigital number, since it uses as much as digits as its factorization.

122664345721987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 243855360, while the sum is 67.

The spelling of 122664345721987 in words is "one hundred twenty-two trillion, six hundred sixty-four billion, three hundred forty-five million, seven hundred twenty-one thousand, nine hundred eighty-seven".